[llvm-dev] Hash of a module

Russell Wallace via llvm-dev
Mon, 21 Dec 2015 16:59:07 -0000

didn't
know they returned change-made. Thanks!

On Mon, Dec 21, 2015 at 12:36 PM, Artur Pilipenko <
apilipenko at azulsystems.com> wrote:

> Are you going to run some of the existing passes? Why can’t you just use
> the returned change-made value from the passes?
>
> Artur
>
> > On 20 Dec 2015, at 15:43, Russell Wallace via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> >
> > I want to run a bunch of optimizations, iteratively, that is keep
> running until things stop changing (to make sure all optimization
> opportunities are taken). As far as I know, there is no way to copy a
> module or compare modules by value, so it occurs to me that a practical
> solution might be to take the hash code of the module and see if that
> changes.
> >
> > A problem is that hash algorithms are designed to work on streams of
> bytes, not compound objects.
> >
> > First attempt at a solution: iterate through all instructions in all
> functions and hash the instruction kinds. I can think of some possible
> changes that would fail to be captured by that.
> >
> > Is there any already known solution?
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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